Thursday
April 24, 2014

Homework Help: Physics

Posted by Michelle on Wednesday, December 10, 2008 at 10:44pm.

i know this is alot to ask for but these 10 i can nott get out of the 30

A man pulls a 10-kg box across a smooth floor with a force of 71 newtons at an angle of 23 degrees and for a distance of 97 meters. How much work, to the nearest joule, does he do?

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2
If the floor in the previous question is angled upward at 11.7 degrees and the man pulls the box up the floor at constant speed, what is the work he does to the nearest joule?

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3
In Problem 2, to the nearest joule, what is the work done by gravity?

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4
In Problem 1, if the box starts from rest, what is its final kinetic energy (to the nearest joule)?

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5
If the mass of the box in the previous problem is 17 kilograms, what is its final speed to the nearest tenth of a meter/sec?

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6
You are traveling in your 1542-kg car at 6 m/s and wish to accelerate to 19.2 m/s in 4 seconds. How much work, to the nearest joule, is required?

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7
In the previous problem what is the average power to the nearest watt?

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8
What is the equivalent (nearest) horsepower in Problem 7?

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9
Assuming you have a bow that behaves like a spring with a spring constant of 70 N/m and you pull it to a draw of 59 cm, to the nearest joule how much work do you perform?

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10
In the previous problem, to the nearest tenth of a m/s, what is the speed of the 107-gram arrow when it is released

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